Title:
METHOD FOR PRODUCING VINYL PYRROLIDONE-BASED POLYMER SOLUTION
Document Type and Number:
WIPO Patent Application WO/2019/167668
Kind Code:
A1
Abstract:
The present invention provides a method for producing a high-concentration, low K-value vinyl pyrrolidone-based polymer solution having superior temporal stability. This method is for producing a vinyl pyrrolidone-based polymer solution having a polymer concentration of 40-70 mass% and a K value of 10-28 as determined by the process introduced by Fikentscher, the method being characterized by comprising a step for adding, to a reaction vessel, monomer components including N-vinyl pyrrolidone and a polymerization initiator containing hydrogen peroxide, and performing polymerization, wherein the amount of the hydrogen peroxide used is 1.6-4.0 mass% with respect to 100 mass% of all the monomers used, and the amount of ammonia used after the addition of the monomer components is 0-0.3 mass% with respect to 100 mass% of all the monomers used.
Inventors:
IKEMOTO YUI (JP)
Application Number:
PCT/JP2019/005544
Publication Date:
September 06, 2019
Filing Date:
February 15, 2019
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08F26/10; C08F2/16; C08F4/40; C08L39/06
Domestic Patent References:
| WO2006049257A1 | 2006-05-11 |
Foreign References:
| JP2002155108A | 2002-05-28 | |||
| JP2008255147A | 2008-10-23 | |||
| JP2008255146A | 2008-10-23 | |||
| JP2012082441A | 2012-04-26 | |||
| JP2007262159A | 2007-10-11 | |||
| JP2015531799A | 2015-11-05 |
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (JP)
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